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Which one of the following statements is TRUE for the ultrasonic machining (USM) process?
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- In USM, the tool vibrates at subsonic frequency.
- USM does not employ magnetostrictive transducer.
- USM is an excellent process for machining ductile materials.
- USM often uses a slurry comprising abrasive-particles and water.
Correct Option: D
USM uses an abrasive slurry which transfers the impact load provided by the vibrating tool to the work piece.